Further compress?
The big problem with that is that's called transcoding, and since you're going from lossy MP3's to lossy MP3's, you'll suffer generation loss in addition to the quality loss due to a lower compression. Think of taking a document you received by fax, then faxing it back, or photocopying a photocopy, a few generations usually results in a garbled mess.
And I'm not sure how much space you would save unless you are willing to really sacrifice quality (i.e. if they are spoken word, you could probably cut it by 1/10th from a high bitrate down to 64kbps or something, convert to mono too).
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